1. Manuals
  2. Brands
  3. GAOTek Manuals
  4. Measuring Instruments
  5. GAOTek-GFL-136
  6. Manual

GAOTek -GFL-136 Manual

Dc ground fault locator
Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
P a g e | 1
GAOTek DC Ground Fault Locator
Product Name
GAOTek-GFL-136
Product SKU
https://gaotek.com/product/gaotek-dc-
Product URL
ground-fault-locator-2/
Based in New York City & Toronto, GAO Tek Inc. is ranked as one of the top 10 global B2B technology suppliers.
GAO ships overnight within the U.S. & Canada & provides top-notch support thanks to its 4 decades of
experience.

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the GAOTek-GFL-136 and is the answer not in the manual?

Questions and answers

Related Manuals for GAOTek GAOTek-GFL-136

Summary of Contents for GAOTek GAOTek-GFL-136

  • Page 1 P a g e | 1 GAOTek DC Ground Fault Locator Product Name GAOTek-GFL-136 Product SKU https://gaotek.com/product/gaotek-dc- Product URL ground-fault-locator-2/ Based in New York City & Toronto, GAO Tek Inc. is ranked as one of the top 10 global B2B technology suppliers.

  • Page 2: Table Of Contents

    P a g e | 2 Contents GAOTek DC Ground Fault Locator ..................5 1.1. Features ..........................5 1.2. Application ........................6 1.3. Function ..........................7 1.4. Technical Specification ..................... 7 Signal analyzer specification: ...................... 7 1.5. Kit Includes ........................9 1.6.
  • Page 3 • Except as explained in this manual, do not attempt to service this equipment yourself. • Do not operate the equipment around explosive gas or vapor. • Only use GAOTek’s testing leads and other relative accessories with the locator. • Before use, inspect the locator, testing leads and other accessories for mechanical damage and replace if necessary.
  • Page 4 P a g e | 4 connectors. • Remove all clamps, testing leads and accessories that are not in use. • Do not apply the instrument in other purposes that are not described in this user manual • Ensure the equipment is provided with adequate ventilation. •...

  • Page 5: Gaotek Dc Ground Fault Locator

    GAOTek DC Ground Fault Locator is the new model which is developed to fast detect, trace and pinpoint virtual ground faults in LIVE DC systems where electrical cables have breakage with current lost to ground.

  • Page 6: Application

    P a g e | 6 • Precise measurement It adopts high accurate current clamp for signal tracing and precise ADC for voltage sampling. This ensures the accurate measurement of voltage and resistance. • User-friendly interface It has LCD display with vivid information indicating grounding status, waveform, insulation leveling, insulation resistance, leakage current, and direction of ground fault and so on.

  • Page 7: Function

    P a g e | 7 1.3. Function • Measures voltage between DC system and ground ranging from 0 to 300V. • Measures grounding resistance up to 999KΩ for both busbars and each branch circuit • It detects and measures AC voltage which interrupts in DC system. Detection range is from 0 to 288V.
  • Page 8 P a g e | 8 • Measurement range: 0-999.9KΩ Resolution: 0.1KΩ • Accuracy: ≤±5% • ▪ Measurement Bridge: • Adjustment range: 0mA, 0.25mA, 0.5mA, 1mA, 2mA & 4mA (Optional) • Frequency range: 0.25Hz ▪ Grounding detection range: up to 200KΩ ▪...

  • Page 9: Kit Includes

    Low power consumption: in answer mode communication, quick data transmission and starting time will effectively lower power consumption. 1.5. Kit Includes ▪ GAOTEK DC GROUND FAULT LOCATOR Signal Analyzer ▪ GAOTEK DC GROUND FAULT LOCATOR Signal Detector ▪ Qty. (1) Signal Testing Leads with clips ▪...

  • Page 10: Operation

    P a g e | 10 DC Current clamp with cable Signal Detector Signal Analyzer 40mm AC Current clamp Battery Charger 4 Batteries for Signal Detector with cable 8mm AC clamp with cable User manual Carrying Case (optional) 2 black measurement cable 2 red measurement cable 1 yellow measurement cable OPERATION...

  • Page 11: Principle Of Ground Fault Location

    P a g e | 11 2.1.1. Principle of Ground Fault Location DC or AC power systems are generally insulated to the ground in railway electric works, power substation, telecom base station and the alike. There are also clear and strict rules for insulating resistance in different voltage levels of DC or AC power systems.

  • Page 12: Principle Of Dc Signal Invasion

    P a g e | 12 In this diagram, Feed 1 is normal feeder without signal fault while Feed n has signal fault on negative. Rx is the grounding resistance for this fault. R is the balancing bridge between two busbars after wire connection of Signal Analyzer.
  • Page 13 P a g e | 13 Extra wire connection: For fault location of this type of fault, Signal Analyzer is connected with 2 different systems with extra wire connection. And measurement bridge will be connected to one DC system and it will compare the voltage and waveform of two systems.

  • Page 14: Principle Of Ac Signal Invasion

    P a g e | 14 2.1.3. Principle of AC Signal Invasion When Signal Analyzer is connected with tested DC system and the measured AC signal is higher than rated value, we call it as AC signal invasion. AC signal location is same as that of general DC ground fault location.
  • Page 15 P a g e | 15 Reset function is to restart the test. It is just like restarting the signal analyzer without turning the On/Off switch. Waveform There is two different waveforms, sine wave and square wave. Please change it as per the current clamp that is connected with Signal Detector.

  • Page 16: General Steps For Ground Fault Location

    It is for turning on or off of the Signal Detector. Note: GAOTek DC Ground Fault Detector is coming with both DC and AC current sensors. For better measurement sensitivity, we will suggest use DC current sensor. If the screen of Signal Detector is dim after power on, battery power might be low, you are suggested to charge the battery timely.

  • Page 17: Analyzer Connection To Dc System

    P a g e | 17 2.3.1. Analyzer connection to DC system Turn off the power on/off button of Signal Analyzer, connect one end of the testing leads (1-into-3) with the analyzer and the other ends connected respectively with positive busbar, negative busbar and the ground based on 3 different colors: •...
  • Page 18 P a g e | 18 After all the testing leads are properly connected, turn on the on/off switch. The Signal Analyzer will be powered by its tested circuit. And you will see the screen display as below: Fig 2.3.1B without ground fault Fig 2.3.1C with ground fault After the power on/off switch is turned on, power indicator in the analyzer will be on.

  • Page 19: Detector Self-Check

    P a g e | 19 2.3.2. Detector Self-check This is ensuring that both Signal Analyzer and Signal Detector are functioning well. To do this please follows the steps below: Install the 4 rechargeable batteries at the back of Signal Detector and switch on the unit.

  • Page 20: Ground Fault Detection

    P a g e | 20 The down arrow in Fig 2.3.2B and Fig 2.3.2C indicates the point for bridge switch. It is at the transition point from high to low in the waveform. In normal self-check with Signal Detector, there will be 2 cycles of signal waveform.
  • Page 21 P a g e | 21 Signal detector will display grounding resistance, waveform, and direction of ground fault for the tested circuit. Green arrow at the bottom screen indicates same direction while red arrow indicates opposite direction to arrow direction of current clamp. For details, please refer to “2.3.4.4 Judge Ground fault based on direction indication”.
  • Page 22 P a g e | 22 Fig 2.3.3.2A Fig 2.3.3.2B 2.3.3.3. Current Measurement This function is to measure leakage current for tested branch. It is only applicable when DC current clamp is used. Please follow the methods below for measurement: Keep the current clamp in natural status with clamp jaw completely closed without clamping on any circuit.
  • Page 23 P a g e | 23 Fig 2.3.4A Compulsory mode Fig 2.3.4B Automatic mode When the measurement mode is changed, the Signal Analyzer will retest the circuit and send this new measurement data to Signal Detector. Compulsory mode: Operation under this working mode, after Signal Analyzer is started, it will calculate grounding resistance of both positive and negative busbars.

  • Page 24: Tips For Ground Fault Location

    P a g e | 24 resistance (repeat measurement of grounding resistance like measurement after analyzer startup). If DC system has insulation fault, it will activate the measurement bridge, otherwise, it will not. When do we use this mode? This mode is used when insulation status of DC system is pretty stable. Most DC systems have pretty stable insulation;...
  • Page 25 P a g e | 25 GAOTek DC Ground Fault Locator is used for ground fault location in LIVE (online) DC system. When it is online, there is always load current and distributed capacitance which become interference to our signal tracing. By clamping around 2 cables (positive and negative feeders of same load like Fig 2.3.4 Branch c, d, e, f and h), it could effectively cancel the interference.
  • Page 26 P a g e | 26 Current: If grounding resistance is too high (example: higher than 50K ohm), you are suggested to change the measurement current on Signal Analyzer to higher level like 2mA. 2.3.4.4. Judge ground fault based on direction indication Direction of ground fault is decided by both arrow mark on the current clamp and arrow indication on Signal Detector.

  • Page 27: Service & Maintenance

    Smooth waveform Fig 2.3.4.5 SERVICE & MAINTENANCE GAOTek DC Ground Fault Locator is precision instrument. To make ensure its accuracy, please handle it with care during operation and transportation to avoid crash, fall down and other series vibration. Before each measurement, please synchronize the signal between Signal Analyzer and Signal Detector in self-check.
  • Page 28 Contact us: sales@gaotek.com Based in New York City & Toronto, GAO Tek Inc. is ranked as one of the top 10 global B2B technology suppliers. GAO ships overnight within the U.S. & Canada & provides top-notch support thanks to its 4 decades of...

Table of Contents